Data Structures

用struct 定義一個Page 其擁有兩個欄位，title 和 body

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type Page struct {
    Title string
    Body  []byte
}

[]byte means “a byte slice”

建立save 方法

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func (p *Page) save() error {
    filename := p.Title + ".txt"
    return ioutil.WriteFile(filename, p.Body, 0600)
}

Takes as its receiver p, a pointer to Page.
It takes no parameters, and returns a value of type error.

0600, 傳送第三參數給 WriteFile, 指出這個檔案只應被建立於目前使用者可讀可寫的權限

建立loadPage 方法

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func loadPage(title string) (*Page, error) {
    filename := title + ".txt"
    body, err := ioutil.ReadFile(filename)
    if err != nil {
        return nil, err
    }
    return &Page{Title: title, Body: body}, nil
}

建立main 方法

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func main() {
    p1 := &Page{Title: "TestPage", Body: []byte("This is a sample Page.")}
    p1.save()
    p2, _ := loadPage("TestPage")
    fmt.Println(string(p2.Body))
}

go build wiki.go
./wiki

REFERENCES